With relation to loading, Birmingham introduced 24hr licenses (which is quite a big deal as there are still areas of Birmingham without any pubs owing to the Quaker influence when Birmingham boomed at the heart of the industrial revolution) and the idea behind that was to stop the last orders surge where people buy lots and then all leave the pubs at the same time and meet up with others from pubs and riotousness, I do not believe that changing the opening hours did have an effect on the overall drunk and disorderly rates